OS04W0014 Analytical method for reduction of residual stress of welded joint using filtered white noise

Abstract

Welded joints are used for construction of many structures. Residual stress is generated near the bead because of locally given heat. Tensile residual stress on the surface degrades fatigue strength. In this paper, a new method for reduction of residual stress using random vibration during welding is proposed. As random vibrational load, filtered white noise is used. Two thin plates are butt-welded. It is found that tensile residual stress near the bead is reduced by using random vibration. Reduction of tensile residual stress is examined by simulation method using simplified analytical model. It is concluded that reduction of residual stress can be demonstrated by using the proposed model.